<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    // window.document.querySelector();
    var num = 10;
    console.log(num);
    console.log(window.num);
    function fn() {
        console.log(11);
    }
    fn();
    window.fn();
    alert(11);
    window.alert(11);
    console.dir(window);
    console.log(window.name);
</script>
</body>
</html>